Kses fixes for permitting some tags

modules/memberships/class-jetpack-memberships.php

@@ -35,6 +35,21 @@ class Jetpack_Memberships {
 	 * @var string
 	 */
 	private static $button_block_name = 'membership-button';
+
+	/**
+	 * These are defaults for wp_kses ran on the membership button.
+	 *
+	 * @var array
+	 */
+	private static $tags_allowed_in_the_button = array(
+		'br'     => array(),
+		'em'     => array(),
+		'strong' => array(),
+		'p'      => array(),
+		'img'    => array(
+			'src' => array(),
+		),
+	);
 	/**
 	 * Classic singleton pattern
 	 *
@@ -243,7 +258,7 @@ public function render_button( $attrs ) {
 			esc_attr( get_locale() ),
 			esc_attr( implode( $classes, ' ' ) ),
 			esc_attr( $button_styles ),
-			esc_html( $data['button_label'] )
+			wp_kses( $data['button_label'], self::$tags_allowed_in_the_button )
 		);
 	}